Add Centroid in window_dict output

[KrishPatel13]

What kind of change does this PR introduce?

Summary

Checklist

• My code follows the style guidelines of OpenAdapt
• I have performed a self-review of my code
• If applicable, I have added tests to prove my fix is functional/effective
• I have linted my code locally prior to submission
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. README.md, requirements.txt)
• New and existing unit tests pass locally with my changes

How can your code be run and tested?

Other information

[KrishPatel13]

@abrichr Any suggestion on how to test this PR practically?
I have tried theoretically here:

Reference: https://stackoverflow.com/a/18932029

[KrishPatel13]

Ready for review @abrichr !

[abrichr]

Thank you @KrishPatel13 ! Just a few small comments.

[KrishPatel13]

@abrichr Ready for Review!